MANAS MISHRA and AMRUTA KHANDEKAR MICROSOFT Corp, health insurer Cigna Corp and Mayo Clinic are part of a coalition pushing for digital records of people who get vaccinated against COVID-19. A key aim of the project, called Vaccination Credential Initiative, is to help people store encrypted digital copies of their immunization records in a digital wallet of their choice, the companies said in a joint statement. These records could eventually be used, with an individual's consent, by colleges that are trying to re-open or even for entry into concerts in the future, Joan Harvey, an executive at Cigna unit Evernorth…